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A 4-lb ball B is traveling around in a circle of radius r1, = 3 ft with a speed (vB)1, = 6...

A 4-lb ball B is traveling around in a circle of radius r1, = 3 ft with a speed (vB)1, = 6 ft/s. If the attached cord is pulled down through the hole with a constant speed vr= 2 ft/s, determine the ball’s speed at the instant r2 = 2 ft. How much work has to be done to pull down the cord? Neglect friction and the size of the ball.

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Solutions For Problems in Chapter 15
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